Hmmm?... I would go even lower; 48 would be my highest bet.
IMO both the 176th and 172nd have at best 8 each and even if we assume that reports are correct and a second squadron (dadui) was formed at the 9th Brigade, that would sum up to only 16 (2x 8) J-20s or in sum 24 all Batch 01 aircraft (with AL-31FN).
I would agree that probably a similar number is now also ready - maybe a third dadui of 8 from Batch 01 (or altogether 30) - and about 18 from Batch 02 using the WS-10C, but that anyway ends at best at 48.
Anyway I'm quite sure we would have heard anything if a new unit would be operational and consequently I don't believe what
@ougoah said: "People on the ground in Chengdu and airbases where J-20s are stationed photograph them like happy meal toys.
They're everywhere now. Can't even keep track of the photos."
IMO they are not everywhere now and we simply can't keep track due to the lack of the photos.
Just my 2 Cents.